Step stool



FIG. 1 is a perspective view of a step stool showing the new design withthe texturing on the top surface shown in broken lines and form no artof the claimed design;

FIG. 2 is a front elevational view thereof, the rear elevational viewbeing identical thereto, with the wheels supporting the step stool shownin broken line;

FIG. 3 is a side elevational view thereof, the unillustrated side beingidentical thereto, with the wheels shown in broken lines;

FIG. 4 is a top plan view thereof, with the surface texturing of the tophorizontal surface of the step stool shown in broken lines as suchtexturing may vary and does not form a part of the design to bepatented; and,

FIG. 5 is a perspective view showing the open bottom and interior of thestep stool with structural elements shown in broken lines as they do notform a part of the design being patented.

The ornamental design for a step stool, as shown and described.